The superfine Fe-B-Si-Mo and Fe-B-Zr-Nb alloys were prepared by liquidus casting in which the levitation melting combining with the rapid solidification was used. The melt was poured into a copper mold at various temperature, and a superfine granular microstructure was obtained at liquidus temperature. The behavior of Cu and Ag addition of Fe-B-Si-Mo and Fe-B-Zr-Nb alloys was studied. Both adding Cu and Ag to Fe-B-Si-Mo and Fe-B-Zr-Nb alloys had influence on refining the alloys. The Refinement effect of adding Cu is stronger than that of adding Ag in Fe-B-Zr-Nb alloy.
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